I've had several different issues with this instance.
By interacting with batteries "out of order" of how the game wants you to progress the puzzle causes there to be one less battery available to access Joon's workshop. You can get the stairs to go up, but you're unable to power the battery at the top of the stairs. Leaving the instance via exit or logout reset it and Taimi.
After entering Joon's Workshop, when she shuffles the trapdoors around, not all of the stair variants come up as they should.
The jade constructs she summons either do not all appear or do not move (can't damage them either).
These bugs are preventing me from progressing the story.